1355538 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種用於液晶顯示（LCD)裝置之背光單 元，並更較-種湘在反射財插置電㈣有效減小寄 生電容産生之感應電流的液晶顯示裝置用背光單元。 【先前技術】 在當前資訊社會’電子顯示褒置的存在價值變得日益 ^要’事實上各種電子顯示裝置已廣用於各種不同產羋界 中，也因此電子顯示裝置被持續加以各種新功能，冀崎 合食訊社會的需求。就-般定義言，電子顯示裝置係指_ =顯示資訊予使用者的裝置。實際上，電子顯示裝置將各 置輸出的電子資訊信號轉變爲能夠被使用者識 錢信號。因此，電子顯示裝置扮演—種使用者 和電子裝置之間的中間媒介角色。 百 顯示裝置包含兩大類型，即光發射型和光接收型。光 示裝置根據照明現象而顯示光資訊信號，並亦被 二板owf顯;Γ裝置’其包含陰極射線管(CRT)、電聚顯 貼D等i f機電致發光顯示器（〇ELD)及發光二極體 頦光接收型顯示裝置顯示根據反射、散射和干涉 ^進^轉換的光資訊㈣，其祕稱純動式顯 颈不裝置及電泳成像顯示裝置（EPID)等。 效率及/或電腦監視器，并因符合經濟 仍>、同市％佔有率。然而，由於cRT仍有笨重、 1355538 佔空間及高耗電量等缺點’故正面臨平面顯示裝置的強勢 挑戰。近來，由於半導體工#的迅速發展而使多種電子裝 置在功耗、尺寸及重量上得到改善’液晶顯示器（lcd厂 PDP及OLED平面顯示裝置已被開發使用，其中LCD裝 置爲-種具有輕薄、低功率損耗及低驅動電料性面 顯示裝置。 抑由於液晶顯示裝置屬於光接收型顯示裝置，故需有背 光單元等光源的存在，此種液晶顯示裝置用背光單元可分 為直下式背光單元和導光板型背光單元兩種。在直下式^ 構中，複數個燈被設置於平面上，且一擴散板被 插置於燈和液晶面板之間，以使液晶面板與燈之間有一* 間存在。在導光板型背光單元中，燈被安裝於平面面板= 外緣’且該燈所發出的⑽過—透明導光板而照射到液晶 ::土。在該二背光單元型式t ’直下式背光單元為常被 者，因其具有高光利用率及易於處理的特點。 X下將配合圖1及圖2說明目前市面所用之液晶顯示 的月光單兀’其中圖1所示為現有液晶顯示裝置之背 光早兀的燈與—底蓋間之寄生電容的剖面圖，圖2則為-加至燈之高電壓及燈與底蓋間之寄生電 電流的波形圖。 如圖1所示，現有液晶顯示裝置的背光單元包含複數 13 t蓋15及一反射膜14，其中該複數個燈13 彼相平行排列，用以發射出光;該底蓋15用以容置燈 13，該反射膜14係形成於底蓋15及燈13之間。該等燈 1355538 13之每-者皆包含一玻璃管及一陰極與一陽極其中該 玻璃s中》又有情性氣體(Ar及Ne)，該陰極與陽極設於該 玻璃管的端#，且破璃㈣内壁上塗覆有勞光劑。 —當- AC電壓自一電源轉換器(ίην_Γ)(未示出)施加 至複數個燈13之每-者的陽極與陰極時，電子從陰極被 釋放出而與玻璃管巾_性氣體發生碰撞，且被釋出的電 子數量以幾何級數增加。當因電子增加而在玻璃管内部產 ，電騎，祕氣體被電子激勵，因此產生激勵分子的能 篁而發出紫外線。接著，該紫外線與塗覆在玻璃管内壁的 螢光劑碰撞’由此發射可見光。 底蓋15係由金屬材料製成。如圖丨所示，寄生電容 Cl C2和C3會在各燈13之間及燈13與反射膜14/底蓋 15_之間産生。實際上，寄生電容C1係形成於各燈13與 底蓋15的一侧之間，寄生電容C2形成於各燈13之間， 寄生電容C3形成於各燈13與下部底蓋15之間。如圖2 所示，當以一高電壓驅動各燈13時，寄生電容^、C2 和C3會産生感應電流。由於感應電係為該等寄生電容 Cl、C2和C3所感應產生，故該感應電流與該高電壓之 間的相位差爲π/2(90。）。由於感應電流不驅動各燈13，因 此各燈13的照明效率被降低。 【發明内容】 鑑於上述，本發明旨在提供一種用於液晶顯示裝置之 月光單元其月匕實負上消除現有同類背光單元之限制及缺 失所産生的一或多個問題。 1355538 一本發明的一個目的在於提供一種能利用減小燈和底 蓋間之寄生電谷所産生的感應電流而有效改善燈之照明 效率的背光單元。 本發明的其它特徵和優點將在以下進行說明，其中的 邛分並可從說明中得知，或透過對本發明的實施而瞭 解。本發明的目的和其它優點亦可藉由以下說明及所附權 利要求書與圖式中描述之結構而獲得了解。1355538 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight unit for a liquid crystal display (LCD) device, and more effectively reduces the parasitic capacitance generated by the power supply (4) A backlight unit for a liquid crystal display device that induces current. [Prior Art] In the current information society, the existence value of electronic display devices has become increasingly important. In fact, various electronic display devices have been widely used in various industries, and electronic display devices have been continuously subjected to various new functions. , the needs of the Miyazaki Food News Society. By way of general definition, an electronic display device refers to a device that displays information to a user. In fact, the electronic display device converts the electronic information signals outputted by the respective devices into signals that can be recognized by the user. Therefore, the electronic display device plays an intermediate medium role between the user and the electronic device. Hundreds of display devices include two types, light emitting type and light receiving type. The light display device displays the light information signal according to the illumination phenomenon, and is also displayed by the two-plate owf; the device includes a cathode ray tube (CRT), an electro-optic display D, an electromechanical display (〇ELD), and a light-emitting device. The polar body light receiving type display device displays light information (4) converted according to reflection, scattering, and interference, and is secretly called a pure motion type neckless device and an electrophoresis imaging display device (EPID). Efficiency and / or computer monitors, and because of the economics still >, the same city share. However, due to the cumbersome cRT, the disadvantage of 1355538 space and high power consumption, it is facing the strong challenge of flat panel display devices. Recently, due to the rapid development of Semiconductors #, various electronic devices have been improved in power consumption, size and weight. 'Liquid crystal displays (LCD devices PDP and OLED flat display devices have been developed and used, among which LCD devices are light and thin, Low power loss and low-drive electric material surface display device. Since the liquid crystal display device is a light-receiving type display device, a light source such as a backlight unit is required, and the backlight unit for the liquid crystal display device can be classified into a direct-type backlight unit. And a light guide plate type backlight unit. In the direct type structure, a plurality of lamps are disposed on a plane, and a diffusion plate is interposed between the lamp and the liquid crystal panel so that there is a * between the liquid crystal panel and the lamp In the light guide type backlight unit, the lamp is mounted on the flat panel = outer edge and the (10) over-transparent light guide plate emitted by the lamp is irradiated to the liquid crystal:: soil. In the two backlight unit type t' straight down The backlight unit is a frequent recipient because of its high light utilization efficiency and easy handling. The X-ray will be used in conjunction with Figure 1 and Figure 2 to illustrate the liquid crystal display currently used in the market. FIG. 1 is a cross-sectional view showing the parasitic capacitance between the backlight of the conventional liquid crystal display device and the bottom cover, and FIG. 2 is a high voltage applied to the lamp and a parasitic electric current between the lamp and the bottom cover. As shown in FIG. 1 , the backlight unit of the conventional liquid crystal display device includes a plurality of 13 t covers 15 and a reflective film 14 , wherein the plurality of lamps 13 are arranged in parallel to emit light; To accommodate the lamp 13, the reflective film 14 is formed between the bottom cover 15 and the lamp 13. Each of the lamps 1355538 13 includes a glass tube and a cathode and an anode, wherein the glass s a gas (Ar and Ne), the cathode and the anode are disposed at the end # of the glass tube, and the inner wall of the glass (four) is coated with a polishing agent. - When - AC voltage is from a power converter (ίην_Γ) (not shown) When applied to the anode and cathode of each of the plurality of lamps 13, electrons are released from the cathode to collide with the glass tube-gas, and the amount of electrons released is increased geometrically. In the inside of the glass tube, the electric ride, the secret gas is electronically excited, thus generating incentives. The ultraviolet ray of the molecule emits ultraviolet rays. Then, the ultraviolet ray collides with the fluorescent agent coated on the inner wall of the glass tube to thereby emit visible light. The bottom cover 15 is made of a metal material. As shown in Fig. ,, the parasitic capacitance Cl C2 And C3 is generated between the lamps 13 and between the lamp 13 and the reflection film 14/bottom cover 15_. Actually, the parasitic capacitance C1 is formed between the lamps 13 and one side of the bottom cover 15, and the parasitic capacitance C2 Formed between the lamps 13, a parasitic capacitance C3 is formed between each of the lamps 13 and the lower bottom cover 15. As shown in Fig. 2, when the lamps 13 are driven at a high voltage, parasitic capacitances ^, C2 and C3 are generated. Inductive current. Since the inductive system is induced by the parasitic capacitances C1, C2, and C3, the phase difference between the induced current and the high voltage is π/2 (90). ). Since the induced current does not drive the lamps 13, the illumination efficiency of each of the lamps 13 is lowered. SUMMARY OF THE INVENTION In view of the above, the present invention has been made in an effort to provide a moonlight unit for a liquid crystal display device which has one or more problems caused by the limitation and absence of the conventional backlight unit of the prior art. 1355538 An object of the present invention is to provide a backlight unit which can effectively improve the illumination efficiency of a lamp by reducing the induced current generated by the parasitic electric valley between the lamp and the bottom cover. Other features and advantages of the invention will be set forth in the description which follows. The objectives and other advantages of the invention will be apparent from the description and appended claims.
^為達到這些與其它的優點及依據本發明之目的，如實 ，例與其廣泛之說明，本發明用於液晶顯示（lcd)裝置之 背光單元包含一光源、一底蓋及電阻，其中該底蓋用以容 置該光源，該擴散板用以對該光源發射出之光加以擴散， s亥電阻，設置於該底蓋及該光源之間。 时在另一實施例中，該種液晶顯示（LCD)裝置所用之背 光單元包含一燈陣列、一底蓋、一擴散板、一光學膜及電 阻丄其中該燈陣列具有複數個燈，用以發射光，該底蓋用 以容置該燈陣列，該擴散板位於該燈陣列上部，用以對該 複數個燈發射的光加以擴散，該光學膜位於該擴散板的上 部，用以改變通過該擴散板之光的行進方向，使得該光的 行進方向垂直於該擴散板，該電阻，位於該底蓋和^燈陣 列之間’並面向該複數個燈。 上述大致說明及以下詳細說明皆僅為對本發明之舉 【實施方式】 現將參照圖式說明本發明的較佳實施例。 1355538 v * 本發明之用於液晶顯示裝置（LCD)之背光單元的一實 施例將參照圖3至圖5進行說明，其中圖3所示為該用於 液晶顯示裝置之背光單元的剖面圖，圖4所示為圖3中之 燈、反射膜和底蓋的剖面圖，圖5所示則為圖3中燈陣列 ' 範例的平面圖。 如圖3和圖4所示，該用於液晶顯示裝置之背光單元 實施例包含一燈陣列13〇、一底蓋15〇、一擴散板12〇、 φ 一光學獏110、一反射膜142及電阻141。該燈陣列130 包含彼此平行設置以發射光的複數個燈131至134，該底 蓋150用以容置該燈陣列13〇，該擴散板12〇位於該燈陣 列130上部，該光學膜110設置在該擴散板120的上部， 該反射膜142設置在該底蓋150和該燈陣列13〇之間，該 等電阻141形成在該反射膜142中。燈陣列13〇之複數個 燈131至134的每一者可以是冷陰極螢光燈（CCFL)或外部 電極螢光燈(EEFL)。各燈131_134包含一玻璃管及一陰極 φ 與一陽極，其中該玻璃管内部具有惰性氣體(Αι*及Ne)， 該陰極與陽極安裝在玻璃管的端部上，惰性氣體填充在玻 璃管内部，且玻璃管的内壁上有螢光劑之塗佈。此外，上 述燈亦可其它類型之燈，即其它類型之燈亦屬於本發明之 發圍。 當一交流（A C )電壓被從電源轉換器（未示出）加至複 數個燈131-134之每一者的陽極和陰極時，電子從陰極被 釋放以與破璃管内的惰性氣體發生碰撞，使得電子數量以 幾何級數增加。當電子之增加使得一電流在玻璃管内部流 1355538 動時’惰性氣體被該等電子激勵，因此産生激勵分子的能 量以發射紫外線。接著，紫外線與塗覆在玻璃管内壁上的 螢光劑碰撞，由此發射出可見光。 擴散板120係由在一透明樹脂製成之膜的兩側上塗 佈以一光擴散元件而形成，用以對複數個燈131至134發 射出的光加以擴散。光學膜110係用以改善入射光通過擴 散板120的效率，其方式為改變光的傳播方向至垂直於擴 散板120。反射膜142將從複數個燈131至134發射的光 朝向擴散板120反射。 如圖4所示’在圖3所示背光單元的一部份2〇〇〇中， 反射膜142設置在底蓋150和燈陣列13〇之間，並更包含 電阻141 ’且電阻141被設置為朝向複數個燈13ι至I% 之每一者。反射膜142係由微形成聚乙烯對苯二酸鹽 (MCPET)所製成’並且對光加以反射，並同時能防止各複 數個燈131至134發射出的光洩漏。更詳而言之，從反射 膜142反射並傳播到燈131至134之側面、前面和後面的 光都被往擴散板120方向導引’從而改善了燈131至134 之光發射效率。 電阻141的體積電阻率以被設定爲約1〇1〇Ωιη至約 1019Ωπί較佳，如此可有效抑制複數個燈131至134與底 蓋150之間形成之寄生電容所產生的感應電流。電阻141 的體積電阻率可以下列等式（1)表示之： E=R*S/C[QM] [等式⑴] 其中“E”爲體積電阻率、“R”爲電阻141的阻值、“ s ” 1355538 爲電阻141之各面向複數個燈131至134之每一者的面 積，“c”則爲電阻14ι的厚度。 電阻141的寬度（B)與燈131至134之兩兩間的距離 (A)比（B/A)以被設定為約〇 3至約i的範圍内為較佳，電 阻141的厚度（C)與反射膜142的厚度（D)比（C/D)以被設定 為約0.05至約0.5的範圍内為較佳。電阻141可以由三聚 氣胺、本紛、乙細酸·共聚物、丙稀酸樹脂、環氧、聚苯乙 烯、苯乙烯丙稀腈（SAN)、丙稀腈二乙烯丁二烯樹脂 (ABS)、聚碳酸酯、PVC(聚乙烯氯乙烯）、尼龍（6.6型）、 乙縮搭均聚物（acetal homopolymer)、聚乙烯（PE)、熱塑性 聚酯、聚乙烯砜（polysulfone)、聚苯醚（PPO)、聚四氟乙烯 (PTFE)、氟乙烯丙稀（FEP)以及其它適合材料之任一者製 成。因此，體積電阻率爲約1〇10Ωιη至約ΐ〇19Ωιη的電阻 141可被輕形成。 再者’容置複數個燈131至134的底蓋150可由金屬 等材料製成。因此，當施加一高電壓以驅動複數個燈i 31 至134時，在燈131與底蓋150之間的寄生電容會産生感 應電流。為降低该感應電流’在該背光单疋中，體積電阻 率爲約101()Ωηι至約1019Ωιη的電阻141被設置在反射膜 142的内部。因此’燈陣列130的複數個燈131至134的 照明效率可被有政k南。也因此，採用本發明之背光單元 的液晶顯示裝置得以使其液晶顯示幕的顯示品質得到提 升。In order to achieve these and other advantages and in accordance with the purpose of the present invention, the backlight unit of the liquid crystal display (LCD) device of the present invention comprises a light source, a bottom cover and a resistor, wherein the bottom cover The light source is used for accommodating the light source, and the diffusing plate is used for diffusing the light emitted by the light source, and is disposed between the bottom cover and the light source. In another embodiment, the backlight unit used in the liquid crystal display (LCD) device includes an array of lamps, a bottom cover, a diffusion plate, an optical film, and a resistor, wherein the lamp array has a plurality of lamps for Emitting light, the bottom cover is for accommodating the lamp array, the diffusion plate is located at an upper portion of the lamp array for diffusing light emitted by the plurality of lamps, and the optical film is located at an upper portion of the diffusion plate for changing The direction of travel of the light of the diffuser plate is such that the direction of travel of the light is perpendicular to the diffuser plate, and the resistor is located between the bottom cover and the array of lamps and faces the plurality of lamps. The above description and the following detailed description are merely illustrative of the preferred embodiments of the invention. 1355538 v * An embodiment of a backlight unit for a liquid crystal display device (LCD) of the present invention will be described with reference to FIGS. 3 to 5, wherein FIG. 3 is a cross-sectional view of the backlight unit for a liquid crystal display device. 4 is a cross-sectional view of the lamp, the reflective film, and the bottom cover of FIG. 3, and FIG. 5 is a plan view of the lamp array of FIG. As shown in FIG. 3 and FIG. 4, the backlight unit embodiment for a liquid crystal display device includes a lamp array 13A, a bottom cover 15A, a diffusion plate 12A, φ, an optical 貘110, a reflective film 142, and Resistor 141. The lamp array 130 includes a plurality of lamps 131 to 134 disposed in parallel with each other to emit light. The bottom cover 150 is for accommodating the lamp array 13A. The diffusion plate 12 is located at an upper portion of the lamp array 130. The optical film 110 is disposed. In the upper portion of the diffusion plate 120, the reflective film 142 is disposed between the bottom cover 150 and the lamp array 13A, and the resistance 141 is formed in the reflective film 142. Each of the plurality of lamps 131 to 134 of the lamp array 13 may be a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL). Each of the lamps 131_134 includes a glass tube and a cathode φ and an anode, wherein the glass tube has an inert gas (Αι* and Ne) inside, the cathode and the anode are mounted on the end of the glass tube, and the inert gas is filled inside the glass tube. And the coating of the phosphor on the inner wall of the glass tube. In addition, the above lamps may be of other types, i.e., other types of lamps are also within the scope of the present invention. When an alternating current (AC) voltage is applied from a power converter (not shown) to the anode and cathode of each of the plurality of lamps 131-134, electrons are released from the cathode to collide with the inert gas in the glass tube. , so that the number of electrons increases in geometric progression. When the electrons increase such that a current flows inside the glass tube at 1355538, the inert gas is excited by the electrons, thereby generating energy for exciting the molecules to emit ultraviolet light. Then, the ultraviolet rays collide with the fluorescent agent coated on the inner wall of the glass tube, thereby emitting visible light. The diffusion plate 120 is formed by coating a light diffusing member on both sides of a film made of a transparent resin for diffusing light emitted from the plurality of lamps 131 to 134. The optical film 110 is used to improve the efficiency of incident light passing through the diffusion plate 120 by changing the direction of propagation of the light to be perpendicular to the diffusion plate 120. The reflective film 142 reflects the light emitted from the plurality of lamps 131 to 134 toward the diffusion plate 120. As shown in FIG. 4, in a portion 2 of the backlight unit shown in FIG. 3, a reflective film 142 is disposed between the bottom cover 150 and the lamp array 13A, and further includes a resistor 141' and the resistor 141 is disposed. Towards each of the plurality of lamps 13ι to I%. The reflective film 142 is made of micro-formed polyethylene terephthalate (MCPET) and reflects light while preventing light leakage from each of the plurality of lamps 131 to 134. More specifically, the light reflected from the reflective film 142 and propagated to the side, front and rear of the lamps 131 to 134 is guided toward the diffusing plate 120 to improve the light emitting efficiency of the lamps 131 to 134. The volume resistivity of the resistor 141 is preferably set to be about 1 〇 1 Ω Ω η to about 10 19 Ω π ί, so that the induced current generated by the parasitic capacitance formed between the plurality of lamps 131 to 134 and the bottom cover 150 can be effectively suppressed. The volume resistivity of the resistor 141 can be expressed by the following equation (1): E = R * S / C [QM] [Equation (1)] where "E" is the volume resistivity, "R" is the resistance of the resistor 141, "s" 1355538 is the area of each of the resistors 141 facing each of the plurality of lamps 131 to 134, and "c" is the thickness of the resistor 14i. The width (B) of the resistor 141 and the distance (A) ratio (B/A) between the lamps 131 to 134 are preferably set in a range of about 〇3 to about i, and the thickness of the resistor 141 (C) The thickness (D) ratio (C/D) to the reflective film 142 is preferably set in the range of about 0.05 to about 0.5. The resistor 141 may be composed of a trimeric amine, a sulfonate, an acetoic acid copolymer, an acrylic resin, an epoxy, a polystyrene, a styrene acrylonitrile (SAN), or an acrylonitrile divinyl butadiene resin ( ABS), polycarbonate, PVC (polyvinyl chloride), nylon (type 6.6), acetal homopolymer, polyethylene (PE), thermoplastic polyester, polysulfone, poly Made of any of phenyl ether (PPO), polytetrafluoroethylene (PTFE), vinyl fluoride (FEP), and other suitable materials. Therefore, the electric resistance 141 having a volume resistivity of about 1 〇 10 Ω ηη to about Ω 19 Ω η can be lightly formed. Further, the bottom cover 150 accommodating the plurality of lamps 131 to 134 may be made of a material such as metal. Therefore, when a high voltage is applied to drive a plurality of lamps i 31 to 134, the parasitic capacitance between the lamp 131 and the bottom cover 150 generates an induced current. In order to reduce the induced current 'in the backlight unit, a resistor 141 having a volume resistivity of about 101 (????) to about 1019?? is disposed inside the reflective film 142. Therefore, the illumination efficiency of the plurality of lamps 131 to 134 of the lamp array 130 can be regulated. Therefore, the liquid crystal display device using the backlight unit of the present invention can improve the display quality of the liquid crystal display panel.
如圖5所示，燈陣列130可為CCFL 131至139和LED 1355538 143至147的組合，或亦可為EEFL 131至139與乙肪143 至147的組合。更詳而言之，CCFL 131至139或者ΕΕρχ 131至139的兩兩之間可設以多個LED 143至147，以改 善液晶顯示裝置的顏色再現度。其它類型的光源和不同的 光源设置亦可適用，並皆屬於本發明之範圍。 如上所述，本發明之液晶顯示裝置的背光單元具有的 ，點是，將體積電阻率爲約1〇ι〇Ωπι至約1〇19Ωιώ的電阻 安裝在反射膜中，用以減小燈與底蓋間之寄生電容所産生 的感應電流，故能有效提高燈陣列中的燈照明效率，也因 此忒種背光單元的液晶顯示裝置得以改善 ，習該㈣術者料對本㈣之耗置 之背光早7L加以各種修改和變形，然而該等改或變化仍不 =本發明的精神及範圍，此，本發明之範圍當以所附 權利要求書範圍的各種修改和變形及其等效範圍。As shown in FIG. 5, the lamp array 130 can be a combination of CCFLs 131-139 and LEDs 1355538 143-147, or can be a combination of EEFLs 131-139 and 143-147. More specifically, a plurality of LEDs 143 to 147 may be provided between CCFLs 131 to 139 or ΕΕρχ 131 to 139 to improve the color reproducibility of the liquid crystal display device. Other types of light sources and different light source arrangements are also suitable and are within the scope of the invention. As described above, the backlight unit of the liquid crystal display device of the present invention has a point that a resistor having a volume resistivity of about 1 〇 〇 Ω π ι to about 1 〇 19 Ω Ω is mounted in the reflective film to reduce the lamp and the bottom. The induced current generated by the parasitic capacitance between the covers can effectively improve the illumination efficiency of the lamp in the lamp array, and thus the liquid crystal display device of the backlight unit can be improved, and the backlight of the (4) processor is used as early as possible. Various modifications and variations of the present invention are possible, and the scope of the invention is not limited by the scope of the appended claims.
12 丄 W538 【圖式簡單說明】 圖式被結合爲說明書的-部分，並當被視作為本說明 二的-部份，其因提供本發明之較佳實施例而對本發明提 /、進一步理解’圖式並與說明文字共同說明本發明之原 理。在圖式中： 圖1為現有液晶顯示裝置用背光單元中燈與底蓋間 之寄生電容的剖面圖；12 丄W538 [Simple Description of the Drawings] The drawings are incorporated as a part of the specification and are considered as part of the present specification, which provides a further understanding of the present invention by providing a preferred embodiment of the present invention. The drawings together with the explanatory text illustrate the principles of the invention. In the drawings: FIG. 1 is a cross-sectional view showing a parasitic capacitance between a lamp and a bottom cover in a backlight unit for a conventional liquid crystal display device;
圖2為一加至燈之高電壓及圖1中寄生電容所產生之 感應電流的波形圖； 圖3為本發明之用於液晶顯示裝置之背光單元實施 例的剖面圖； 圖4為圖3所示背光單元之一包含燈、反射膜及底蓋 之部份的剖面圖；及 圖5為圖3中燈陣列範例的平面圖。 【主要元件符號說明】 13 燈 14 反射膜 15 底蓋 110 光學膜 120 擴散板 130 燈陣列 131-134燈 131-139冷陰極螢光燈 (CCFL)/外部電極 螢光燈（EEFL) 143-147發光二極體(LED；) 142 反射膜 141 電阻 150 底蓋 2000 背光單元之部份2 is a waveform diagram of a high voltage applied to a lamp and an induced current generated by the parasitic capacitance of FIG. 1. FIG. 3 is a cross-sectional view of an embodiment of a backlight unit for a liquid crystal display device of the present invention; FIG. One of the illustrated backlight units includes a cross-sectional view of a portion of the lamp, reflective film, and bottom cover; and FIG. 5 is a plan view of the lamp array example of FIG. [Main component symbol description] 13 Lamp 14 Reflective film 15 Bottom cover 110 Optical film 120 Diffuser plate 130 Lamp array 131-134 Lamp 131-139 Cold cathode fluorescent lamp (CCFL) / External electrode fluorescent lamp (EEFL) 143-147 Light-emitting diode (LED;) 142 Reflective film 141 Resistance 150 Bottom cover 2000 Part of the backlight unit
1313